Slide calendar lightbox



FIG. 1 is an isometric front elevation view, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a rear elevation view;

FIG. 3 is a right side elevation view;

FIG. 4 is a left side elevation view;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a slide calendar lightbox, as shown and described. 